/Engine/Source/Editor/BlueprintGraph/Classes/K2Node_EditablePinBase.h
Removes a pin from the user-defined array, and removes the pin with the same name from the Pins array
void RemoveUserDefinedPin ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FUserPinInfo](API\Editor\BlueprintGraph\FUserPinInfo) > PinToRemove )